Answer:
Question: At what time will Teresa take a flight from Lima.
Answer: 9:30 a.m
Explanation: In the letter she says "Tengo una escala de cincuenta minutos, y después llego a Cuzco a las nueve y media de la mañana.." In English translation she is saying "I am going to escalate for 50 minutes and then at 9:30 I am going to be at Cuzco."